觀無量壽佛經義疏 2.111

2.111

「『一一水中有六十億七寶蓮華。』」一一水中，即上八池，各六十億。《小本經》中四色四光；今言七寶，故知多別。二、明量。

"‘In each water there are six billion seven-jeweled lotus flowers.’" "In each water" refers to the eight ponds mentioned above, each having six billion. In the Shorter Sūtra there are four colors and four lights; here it says seven jewels, hence we know there are many differences. Second, explaining the measure.